Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5838791 | Encoder and decoder | Noboru Iwayama, Masahiko Takenaka, Takayuki Hasebe, Masahiro Matsuda | 1998-11-17 |
| 5832083 | Method and device for utilizing data content | Noboru Iwayama, Takayuki Hasebe, Masahiko Takenaka, Masahiro Matsuda | 1998-11-03 |
| 5822771 | System for management of software employing memory for processing unit with regulatory information, for limiting amount of use and number of backup copies of software | Ryota Akiyama | 1998-10-13 |
| 5761651 | Software charging system and software data utilization permitting device | Takayuki Hasebe, Noboru Iwayama, Masahiko Takenaka, Masahiro Matsuda | 1998-06-02 |
| 5761308 | System for refunding payment for software | Haruhiko Tsunoda, Masao Fujiwara, Takayuki Hasebe | 1998-06-02 |
| 5623548 | Transformation pattern generating device and encryption function device | Ryota Akiyama, Noboru Iwayama, Kenichi Utsumi | 1997-04-22 |
| 5621794 | Moving-picture encipherment method and system, and enciphered moving-picture decipherment method and system | Masahiro Matsuda, Takayuki Hasebe, Noboru Iwayama, Masahiko Takenaka | 1997-04-15 |
| 5584022 | Enciphered file sharing method | Hiroaki Kikuchi, Ryota Akiyama, Takayuki Hasebe | 1996-12-10 |
| 5499299 | Modular arithmetic operation system | Masahiko Takenaka, Takayuki Hasebe, Ryota Akiyama | 1996-03-12 |
| 5325433 | Encryption communication system | Takayuki Hasebe, Ryota Akiyama | 1994-06-28 |
| 5313521 | Key distribution protocol for file transfer in the local area network | David B. Newman, Jr. | 1994-05-17 |
| 5065430 | Voice band splitting scrambler | Ryota Akiyama, Mitsuhiro Azuma | 1991-11-12 |
| 4959863 | Secret speech equipment | Mitsuhiro Azuma, Fumio Amano, Ryota Akiyama | 1990-09-25 |